Amazon has a new "citations" feature for academic books. If the book is one for which "Search inside this book" is enabled, Amazon will tell you what other books are cited by the given book, and also what other books (with "Search inside" enabled) cite the given book.

For example, take the Amazon page for one of my favorite philosophy books, On the Plurality of Worlds, by David Lewis. In the citations section, we see that this book cites 29 other books in Amazon's catalog, including The Shape of Space, by Graham Nerlich, and Science without Numbers, by Hartry Field. There are 120 books in the Amazon catalog that cite Plurality, such as Supervenience and Mind, by Jaegwon Kim. There are even links to images of the pages where the citations occur.

It's trackback for books!

(þ Brad DeLong.)

Why didn’t I think of this?

Are you fed up with bringing bananas to work or school only to find them bruised and squashed? Our unique, patented device allows for the safe transport and storage of individual bananas letting you enjoy perfect bananas anytime, anywhere.

The Banana Guard was specially designed to fit the vast majority of bananas. Its other features include multiple small perforations to facilitate ventilation thereby preventing premature ripening and a sturdy locking mechanism to keep the Banana Guard closed. The Banana Guard is of course dishwasher safe for easy cleaning.

(þ Boing Boing.)

Guys, has your girlfriend dumped you for the boyfriend’s arm pillow? Don’t worry, the Kameo corporation of Japan has something for you, too. The amazing new girlfriend’s lap pillow will get you through those lonely nights without her.

(þ Pure Land Mountain, which doesn’t seem to have permalinks.)